Tuning between a fractional topological insulator and competing phases at ν T = 2 / 3
Abstract
We study a spinful, time-reversal symmetric lowest Landau level model for a flatband quantum spin Hall system at total filling fraction ν T = 2 / 3 . Such models are relevant, e.g., for spin-valley locked moiré transition metal dichalcogenides. The opposite Chern number of the two spins hinders the formation of a quantum Hall ferromagnet, instead favoring other phases. We study the phase diagram in dependence on different short-range Haldane pseudopotentials v m and uncover several phases: a fractional topological insulator, a phase-separated state, a spin-polarized fractional quantum Hall state, and the partially particle-hole transformed Halperin (111) state. The effect of the pseudopotentials v m depends on the parity of m , the relative angular momentum.
Fields of Study & Subjects
Atomic and Subatomic Physics Research
Physics of Superconductivity and Magnetism
Cold Atom Physics and Bose-Einstein Condensates
Publication details
- Journal / source
- Physical Review Research
- Publisher
- American Physical Society (APS)
- Volume
- 8
- Issue
- 1
- Publication date
- 8 January 2026
- Language
- EN